I mean, Vinland Saga gave me the impression that it tries to depict a more grounded vikings life. Not sure why you'd compare it to action-flicks. When I'm watching Dragonball, ridiculous shit is ok. When I'm watching Monster, it's not.
If I took Hollywood movies to compare VS's general atmosphere to, I'd choose movies like The Patriot or Braveheart - stories where the hero killed countless foot soldiers, but had to work for it.Unfortunately, not the case in this anime.